Jove
Visualize
Contáctanos
JoVE
x logofacebook logolinkedin logoyoutube logo
ACERCA DE JoVE
Visión GeneralLiderazgoBlogCentro de Ayuda JoVE
AUTORES
Proceso de PublicaciónConsejo EditorialAlcance y PolíticasRevisión por ParesPreguntas FrecuentesEnviar
BIBLIOTECARIOS
TestimoniosSuscripcionesAccesoRecursosConsejo Asesor de BibliotecasPreguntas Frecuentes
INVESTIGACIÓN
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchivo
EDUCACIÓN
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualCentro de Recursos para ProfesoresSitio de Profesores
Términos y Condiciones de Uso
Política de Privacidad
Políticas

Videos de Conceptos Relacionados

Photoelectric Effect02:26

Photoelectric Effect

When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
Temperature Dependence on Reaction Rate02:55

Temperature Dependence on Reaction Rate

The Collision Theory
Atoms, molecules, or ions must collide before they can react with each other. Atoms must be close together to form chemical bonds. This premise is the basis for a theory that explains many observations regarding chemical kinetics, including factors affecting reaction rates.
The collision theory is based on the postulates that (i) the reaction rate is proportional to the rate of reactant collisions, (ii) the reacting species collide in an orientation allowing contact between...
Le Chatelier's Principle: Changing Temperature02:19

Le Chatelier's Principle: Changing Temperature

Consistent with the law of mass action, an equilibrium stressed by a change in concentration will shift to re-establish equilibrium without any change in the value of the equilibrium constant, K. When an equilibrium shifts in response to a temperature change, however, it is re-established with a different relative composition that exhibits a different value for the equilibrium constant.
To understand this phenomenon, consider the elementary reaction:
Effect of Temperature Change on Reaction Rate02:28

Effect of Temperature Change on Reaction Rate

The Arrhenius equation,
Variables Affecting Phosphorescence and Fluorescence01:26

Variables Affecting Phosphorescence and Fluorescence

Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
Switching of BJT01:22

Switching of BJT

Switching behavior in Bipolar Junction Transistors (BJTs) is a fundamental aspect utilized in various electronic circuits, particularly for digital logic applications like switches and amplifiers. In a typical switching circuit, a BJT alternates between cut-off and saturation modes, corresponding to the "off" and "on" states, respectively, thus behaving like an ideal switch.
Cut-off Mode ("Off" State): In this state, both the emitter-base and collector-base junctions are reverse-biased. The...

También podría leer

Artículos Relacionados

Artículos vinculados a este trabajo por autores compartidos, revista y gráfico de citas.

Ordenar por
Same author

Bromide-Mediated Low-Energy Ru<sup>IV</sup>═O Pathway of Stable Water Oxidation.

Angewandte Chemie (International ed. in English)·2026
Same author

Association of Age with Outcomes in Adrenocortical Carcinoma: A Combined Cancer Registry and Multi-Omic Analysis.

Cancers·2026
Same author

Triple-phase interfaces for electrochemical reduction of carbon dioxide.

Chemical Society reviews·2026
Same author

Key refinements to a large animal model for measurement of real-time lymphatic transport.

BMC medical imaging·2025
Same author

Precise Detection of Surgical Margin in Head and Neck Cancer Using Dual Near-Infrared Imaging of the Tumor and Tumor Microenvironment.

Biomaterials research·2025
Same author

IL-7 promotes the formation of DNA double strand breaks and DNA repair in murine pro-B cells.

Frontiers in immunology·2025

Video Experimental Relacionado

Updated: Jul 6, 2026

A Novel Technique for Generating and Observing Chemiluminescence in a Biological Setting
08:57

A Novel Technique for Generating and Observing Chemiluminescence in a Biological Setting

Published on: March 9, 2017

Encendiendo y apagando el interruptor de luz [Ru(bpy) 2dppz]2+ con la temperatura.

Matthew K Brennaman1, James H Alstrum-Acevedo, Cavan N Fleming

  • 1Venable and Kenan Laboratories, Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.

Journal of the American Chemical Society
|December 12, 2002
PubMed
Resumen

Las mediciones de la vida útil del estado excitado revelan que el efecto de interruptor de luz en [Ru(bpy) 2dppz] ((2+) es impulsado por la energía y la entropía, no por la reversión del estado. Esto proporciona una comprensión unificada de su fotofísica a través de diferentes solventes.

Más Videos Relacionados

Forced Flowering in Mandarin Trees under Phytotron Conditions
08:42

Forced Flowering in Mandarin Trees under Phytotron Conditions

Published on: March 6, 2019

Operation of Laboratory Photobioreactors with Online Growth Measurements and Customizable Light Regimes
05:21

Operation of Laboratory Photobioreactors with Online Growth Measurements and Customizable Light Regimes

Published on: October 28, 2021

Videos de Experimentos Relacionados

Last Updated: Jul 6, 2026

A Novel Technique for Generating and Observing Chemiluminescence in a Biological Setting
08:57

A Novel Technique for Generating and Observing Chemiluminescence in a Biological Setting

Published on: March 9, 2017

Forced Flowering in Mandarin Trees under Phytotron Conditions
08:42

Forced Flowering in Mandarin Trees under Phytotron Conditions

Published on: March 6, 2019

Operation of Laboratory Photobioreactors with Online Growth Measurements and Customizable Light Regimes
05:21

Operation of Laboratory Photobioreactors with Online Growth Measurements and Customizable Light Regimes

Published on: October 28, 2021

Área de la Ciencia:

  • La fotoquímica es la fotoquímica.
  • Coordinación Química de la Coordinación
  • La espectroscopia es una técnica de espectroscopia.

Sus antecedentes:

  • Los complejos de polipiridil de rutenio como [Ru(bpy) 2dppz] ((2+) exhiben propiedades fotofísicas únicas.
  • El efecto "interruptor de luz", donde la luminiscencia se mejora en ciertos entornos, es una característica clave.
  • Comprender la dinámica de los estados excitados es crucial para su aplicación.

Objetivo del estudio:

  • Para investigar el tiempo de vida del estado excitado dependiente de la temperatura de [Ru(bpy) 2dppz] ((2+).
  • Para dilucidar los mecanismos fotofísicos subyacentes al efecto de interruptor de luz tanto en solventes proticos como aproticos.
  • Para conciliar los modelos existentes de comportamiento de estado excitado.

Principales métodos:

  • Mediciones de la duración del estado excitado dependientes de la temperatura.
  • Análisis espectroscópico en diversos entornos de disolventes (prótico y aprotico).

Principales resultados:

  • Se estableció una imagen unificadora de la fotofísica del estado excitado, aplicable a ambos tipos de disolventes.
  • La evidencia apoya la existencia de estados similares a bpy y phz relacionados con el ligando dppz.
  • El tamaño orbital del estado brillante es comparable al estado (3) MLCT en [Ru(bpy) 3) ((2+).

Conclusiones:

  • El efecto interruptor de luz no es causado por una inversión de estado.
  • El estado oscuro permanece energéticamente favorecido, incluso en disolventes aproticos.
  • El comportamiento del interruptor de luz surge de un equilibrio entre la energía que favorece el estado oscuro y la entropía que favorece el estado brillante (bpy).